CoolIP index Most recent edit: Thursday March 13, 2014 SearchSite
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Dancing Kite with FlyGen Turbine On-Tether ("Jump-Rope"
Mode) A low-velocity dancing lifter kite can naturally fling a flygen turbine set mid-tether into high-velocity loops and eights. Call this AWES principle "jump-rope" mode, since the kinematics of a person driving a jump-rope at high speed is identical. The inherent mass of the flygen and its conductor condition the motion into regular periodic patterns. At most, only a directional vane is needed to keep the turbine oriented to the apparent wind. In a 10m sec wind, the upper kite, likely a parafoil, might dance in 20m sec motion to drive the flygen sweep at 50m sec, with a turbine tip-speed somewhere around 200m sec, under conservative assumptions. This is another way to get high-rpm generation (to compare with earlier turbine-on-a-wing designs by PierreB, Makani, Lynn, KLG, etc.). It solves the problem of how to avoid an expensive, fragile, poorly-scalable, rigid-wing while gaining the desired fast motion at the harvesting turbine. There are many interesting issues, like how this approach effectively harvests the wind right at the top of allowed altitude. The lower flygen is mostly using the lower air as a quasi-static medium to act against, rather than as the source of motive power. The mass is rendered useful, and the conductor length is kept shorter than previous sweeping flygens of comparable power potential. This is mostly a refinement of ideas long ago introduced on the Forum (like hosting a Makani AWES under a lifter) with details added over time as our knowledge grows. CC BY NC SA
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